Could you describe exactly what's happening? Are you logged in to both the computer n]and the iPad Evernote program/app (logged in with the same account, that is)? Do you have the computer version rung? Hate to ask this - but are you connected to the Internet (you must have an online connection to make any sync work)?
To describe what happens for me: I make a change to a note in my Evernote file on the iPad (I'm logged into my account). Then, I can hit sync to force it to sync right then and there. Then, I go to my Evernote on my PC and the changes are there. The reserse is the same for actions done on the PC (can get them on the iPad).
I don't know why yours doesn't work - its all automatic as long as you are logged in...
Marilyn